mirror of https://github.com/k3s-io/k3s
103 lines
2.5 KiB
Go
103 lines
2.5 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package kv
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import (
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"bufio"
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"bytes"
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"fmt"
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"os"
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"strings"
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"unicode"
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"unicode/utf8"
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"k8s.io/apimachinery/pkg/util/validation"
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)
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// Pair represents a <key, value> pair.
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type Pair struct {
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Key string
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Value string
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}
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var utf8bom = []byte{0xEF, 0xBB, 0xBF}
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// KeyValuesFromLines parses given content in to a list of key-value pairs.
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func KeyValuesFromLines(content []byte) ([]Pair, error) {
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var kvs []Pair
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scanner := bufio.NewScanner(bytes.NewReader(content))
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currentLine := 0
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for scanner.Scan() {
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// Process the current line, retrieving a key/value pair if
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// possible.
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scannedBytes := scanner.Bytes()
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kv, err := KeyValuesFromLine(scannedBytes, currentLine)
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if err != nil {
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return nil, err
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}
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currentLine++
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if len(kv.Key) == 0 {
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// no key means line was empty or a comment
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continue
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}
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kvs = append(kvs, kv)
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}
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return kvs, nil
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}
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// KeyValuesFromLine returns a kv with blank key if the line is empty or a comment.
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// The value will be retrieved from the environment if necessary.
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func KeyValuesFromLine(line []byte, currentLine int) (Pair, error) {
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kv := Pair{}
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if !utf8.Valid(line) {
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return kv, fmt.Errorf("line %d has invalid utf8 bytes : %v", line, string(line))
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}
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// We trim UTF8 BOM from the first line of the file but no others
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if currentLine == 0 {
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line = bytes.TrimPrefix(line, utf8bom)
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}
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// trim the line from all leading whitespace first
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line = bytes.TrimLeftFunc(line, unicode.IsSpace)
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// If the line is empty or a comment, we return a blank key/value pair.
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if len(line) == 0 || line[0] == '#' {
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return kv, nil
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}
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data := strings.SplitN(string(line), "=", 2)
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key := data[0]
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if errs := validation.IsEnvVarName(key); len(errs) != 0 {
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return kv, fmt.Errorf("%q is not a valid key name: %s", key, strings.Join(errs, ";"))
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}
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if len(data) == 2 {
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kv.Value = data[1]
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} else {
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// No value (no `=` in the line) is a signal to obtain the value
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// from the environment.
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kv.Value = os.Getenv(key)
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}
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kv.Key = key
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return kv, nil
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}
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